3-15
ROTATION BEARING LUBRICATION
There is one grease zerk remote-mounted in on the right side of the chassis, behind the fuel
reservoir.This should be used to lubricate the bearing every 50 hours. Rotate the turntable at
least one revolution while pumping grease into the zerk. Use about 8 ounces (230cc) of grease
each time the bearing is lubricated.
Also, lubricate the gear teeth of the rotation bearing at the 50-hour interval. Remove the pinion
cover. Brush open gear grease, such as Mobilkote-S, on the teeth on each side of the pinion at
four places around the bearing. Rotate the turntable several times and check the coverage of
the grease on all of the teeth. Replace the pinion cover.
BRAKE SYSTEM MAINTENANCE
W A R N I N G
The brake system of the RT-400 requires routine maintenance to ensure proper opera-
tion. Failure to properly maintain the brake system may result in property damage, inju-
ry, or death.
Brake Malfunction Icon: Located on the dash display. If the icon is present during normal
crane operation, driving the crane, or operating the brakes, discontinue operating the crane and
take out of service. This icon indicates that the pressures in the brake accumulators are too low
for reliable brake operation. The problem must be found and fixed before driving the crane any
further.
To check that the brake malfunction icon is operating correctly, turn the ignition key to the ON
position, but do not start the engine. Pump the brake pedal several times to discharge the ac-
cumulators. If the icon does not turn on, there is a malfunction in the sensor or wiring. The
problem must be found and fixed before driving the crane.
Brake Unloading Valve:
Mounted under the floorboard of the operator’s compartment. Also
called an accumulator charging valve. The brake unloading valve sends pressure to the accu-
mulators if low pressure is detected. No routine maintenance is needed on the brake unloading
valve. The operator can hear the accumulators charge. If the accumulators charge frequently
without depressing the brake pedal, the brake unloading valve, accumulators, or brake hoses
may be leaking. If no leaks can be found, check accumulator pre-charge pressure. If pre-
charge pressure is adequate, it may be necessary to repair or replace the brake unloading
valve. If the accumulators do not charge, take a long time to charge, or cycle very rapidly, it
may be necessary to repair or replace the brake unloading valve.
Relief pressure for the brake circuit is located in the unloading valve. It is set at 2925 PSI (202
bar) at the factory. The relief pressure cannot be adjusted. The relief pressure can be checked
by installing a pressure gauge at the P port of the valve.
Brake Modulating Valve
: Directly connected to the brake pedal. This valve sends pressure and
flow to the wet disc brakes in the axles when the brake pedal is depressed. Lubricate the pedal
hinges with a silicone lubricant. No other routine maintenance is required.
If the brakes do not apply or release appropriately and the Brake Malfunction Light is not illumi-
nated, the brake modulating valve may need repair or replacement.
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